US United States Major Regions Postal Code Details
🏛️ Marshall · Kansas
66403
Axtell
66406
Beattie
66411
Blue Rapids
66412
Bremen
66427
Frankfort
66508
Herkimer
66438
Home
66427
Lillis
66508
Marysville
66518
Oketo
66541
Summerfield
66544
Vermillion
66544
Vliets
66548
Waterville
📮US United States Regional Postal Code FAQ & Postal Regulations
📮 What is the format of a US ZIP code?
Standard format is 5 digits (e.g., 10001). Extended format is ZIP+4 (9 digits like 10001-1234) with a hyphen.
🔍 How to find the ZIP code for an address?
Use the USPS ZIP Code Lookup tool by entering the full address on the official USPS website.
⚠️ What happens if I use a wrong ZIP code?
Mail may be delayed, returned, or lost. For important documents, use USPS tracking and verify the ZIP code.
🔄 Do ZIP codes ever change?
Yes, USPS may update ZIP codes due to regional adjustments. Always confirm your ZIP code after an address change.
📦 Is a ZIP code required for international mail to the US?
Absolutely. Always include the US ZIP code at the end of the address (e.g., New York, NY 10001 USA).